Brand new Patek Philippe Sky Moon gent's watch, Model # 5102G.18k white gold 36mm case with a crocodile leather strap and 18k white gold deploy buckle. Automatic movement. Hours, minutes and celestial display. Retrograde - watch with a retrograde display does not display the function in a circular fashion, as we are used to seeing. Rather, it sets out the functions in a linear manner. Instead of the hands going round in a circle, they travel along an arc, and when they get to the end, they jump back to the beginning. Sky Moon - The night sky of the Northern Hemisphere rotates counter clockwise on its dial, showing the angular progression of the stars relative to the meridian passage of Sirius. At the same time, the display shows the meridian passage and phases of the moon. Two hands from the center show the hours and minutes of mean solar time on a dial with Roman numerals. The complex astronomical displays rely on a system of stacked sapphire crystal discs which rotate at different speeds and create a mesmerizing impression of depth. The celestial background is a blue sapphire crystal disc in a wheel with 279 teeth. This disc reproduces the orbit of the moon. Via a planetary gear train, it also drives a subsidiary sapphire crystal disc depicting the waxing and waning of the moon in a small round aperture. Above it, in a wheel with 356 teeth, lies a transparent sapphire crystal disc which bears the sky chart on one side and an image of the Milky Way galaxy on the other. These three discs are protected by the sapphire crystal glass with an ellipse on the inside that frames the portion of the sky visible above Geneva.Also known as:Patak, Phillipe, Phillippe, 5102, 5102G, 5102 G, Celestial